RISING PHYLLOTAXIS. Ill 



Algal segmentation; the whole thus affording a remarkable con- 

 firmation of the original hypothesis, that the formation of massive 

 primordia follows the same laws which control the production of 

 lateral members consisting of single cells. The members which, 



Fig. 44. — Expansion system : log. spiral scheme for the introduction of new paths 

 which determine the rise of phyllotaxis ratios in the oapitulum of ITelianthtts 

 annwiis from (8 + 13) to (21 + 34). A small capitulum is taken as a, type ; the 

 genetic .spiral winds left ; the small amount of unavoidable error in construction 

 is admitted in the (8 + 13) system. 



in the diagram drawn by this method, exhibit the greatest deviation 

 from "square" areas, are the transitional members which subse- 

 quently produce ray-florets. With the view of making the 



H 



